A brain injury or some other health problem can cause growing pressure inside your skull. This dangerous condition is called increased intracranial pressure (ICP). It can lead to a headache. It can also further injure your brain or spinal cord....more

Cluster headaches are rare and cause severe pain that tends to recur in the same way each time. Cluster headaches occur in groups, or clusters, and each attack last about 1 to 3 hours on average....more

Cluster headaches -- called "cluster" because of their pattern of striking in groups or clusters -- hit at the same time of day for a period of weeks or months, then vanish as suddenly and as mysteriously as they appeared....more

This often severe, throbbing type of headache is different from other types of headaches in that symptoms other than pain occur with the headache. Nausea and vomiting, lightheadedness, sensitivity to light (photophobia), and other visual disturbances are common migraine symptoms....more